鈦基合金擁有質地輕、高強度、低楊氏係數、高抗腐蝕性與良好的生物相容性，因此常用於航空工業與生醫產業。而部分的鈦基合金也廣泛的應用在塊狀金屬玻璃材料中。研究指出Ti-Cu-Ni-Si合金系統可增強鈦基合金在高溫環境下的應用及良好的金屬玻璃成行性。在合金材料製作上對於合金性質的控制主要仰賴幾個條件因子，如合金元素的組成、熱處理條件、鑄造時冷卻速率與相結構關係。這些條件因子都可以利用可靠的合金相圖與特定溫度範圍的平衡相關係來進行熱力學模擬。因此建立Ti-Cu-Ni-Si四元系合金800 oC平衡相圖，希望能藉由平衡相圖的輪廓及熱分析實驗結果，提供尋找良好新鈦基合金材料成分的參考資料。
本研究主要是利用吸引式真空熔煉爐的方式配置不同組成的合金試片，將合金試片放置高溫管狀爐800 oC進行維持四週的均質化熱處理，使合金試片達到相平衡。達相平衡的合金試片分別進行SEM與EPMA分析。根據以上所有量測結果完成初步Ti-Cu-Ni-Si四元系800 oC於富鈦區平衡相圖。再利用初步的Ti-Cu-Ni-Si四元系800 oC於富鈦區平衡相圖進行選點，選擇特定區域的Ti-Cu-Ni-Si四元合金與純鈦擴散偶接合試片，並進行SEM與EPMA分析，擴散偶合金試片的分析結果將確認Ti-Cu-Ni-Si四元系800 oC於富鈦區平衡相圖的完整性。
此Ti-Cu-Ni-Si四元系800 oC於富鈦區平衡相圖發現了八個三相平衡區與四個四相平衡區，並利用相律與實驗結果推測，可能會有Ti-Ti-Ti2Cu-Ti3Si這個四相平衡區的存在。此實驗區域中並無發現Ti-Cu-Ni-Si四元相與Ti-Cu-Ni-Si三元相，只有單元相與二元相。
從添加不同Si含量的Ti-Cu-Ni合金可以得到，一個完整的Ti-Cu-Ni-Si四元合金800 oC平衡相圖，並建立了兩個不同Si含量的Ti-TiCu-TiNi 800 oC恆溫截面，分別為Ti-TiCu-TiNi (5 at. % Si) 800 oC恆溫截面與Ti-TiCu-TiNi (10 at. % Si) 800 oC恆溫截面。
Ti2Cu的最大固溶度範圍10.14±0.21at. % ~ 13.22±0.59 at. % Ni且對於Si幾乎沒有固溶度。TiNi的最大固溶度可達到30.89±0.28 at. % Cu且Si幾乎沒有固溶度。

Titanium alloys have been used in the aerospace and biomedical industry due to their high specific strength, low Young’s modulus, high corrosion resistance, and good biocompatibility. Some of Ti-based alloys exist good glass formability and become bulk metallic glass (BMG) alloys. The objective of this study could provide the guide line for the alloy design of bulk metallic glasses. This study was performed by means of equilibrated alloys and diffusion couples. Electron microprobe analyses were used to determine the phase compositions and phase relationships.
There are four phases equilibrium, Ti3Si-Ti2Cu-Ti2Ni-Ti5Si3, Ti3Si-Ti2Cu-Ti2Ni-Ti, TiNi-Ti2Cu-Ti2Ni-Ti5Si3, were found in the Ti-Cu-Ni-Si alloy in Ti rich region at 800 oC. And no ternary or quaternary intermetallic phase found in this Ti rich region. All of the intermetallic phases were extended from the binary intermetallic phases. The solubility ranges of the intermetallic phases were determined. The maximum solubility of Cu that is determined by Ti2Cu-TiCu-TiNi-Ti5Si3 is up to 28.94 at.% in TiNi. Then in Ti2Cu-Ti2Ni-TiNi-Ti5Si3 region the max solubility of Ni in Ti2Cu is up to 13.22 at. %.

論文審定書 i
誌謝 ii
中文摘要 iv
英文摘要 vi
目錄 viii
壹、前言 1
貳、文獻回顧 3
2 Cu-Ni-Si-Ti系統合金發展與相關係 3
2.1 Cu-Ni-Ti合金的發展歷史 3
2.2 Cu、Ni、Ti合金系統結構及固態反應 4
2.2.1 Cu-Ti二元系合金平衡相圖 4
2.2.2 Cu-Ni-Ti合金的偽二元系統 4
2.2.3 Cu-Ni-Ti三元合金系統液相投影圖 6
2.2.4 Cu-Ni-Ti三元合金系統的恆溫截面圖 6
2.2.5 Cu-Ni-Ti三元合金的材料性質與其應用 7
2.3 Ni、Si、Ti合金系統結晶結構及固態反應 7
2.3.1 Ni-Ti二元系合金平衡相圖 7
2.3.2 Ti-Si二元系合金平衡相圖 8
2.3.3 Ni-Ti-Si三元合金系統的結晶結構與固相反應 8
2.3.4 Ni-Ti-Si三元合金系統液相投影圖與其平衡反應 9
2.3.5 Ni-Ti-Si三元合金系統恆溫截面 9
2.3.6 Ni-Ti-Si三元合金的材料性質與應用 10
2.4 Cu、Si、Ti合金系統的發展歷史 10
2.4.1 Cu、Si、Ti合金系統結晶結構及固態反應 10
2.4.2 Cu、Si、Ti三元合金系統液相投影圖與其平衡反應 11
2.4.3 Cu-Si-Ti三元合金系統恆溫截面 12
叁、實驗步驟 12
3.1合金試片的配製 13
3.2 擴散偶試片製作 15
3.3 均質化熱處理 15
3.4 SEM與EPMA的量測分析 16
3.5 DTA的量測分析 16
3.6 平衡相圖的量測分析 18
肆、結果與討論 18
4.1 Ti-Cu-Ni-Si四元系合金的EPMA成分分析 19
4.1.1 (Ti80Cu10Ni10)100-xSix 合金 19
4.1.2 (Ti80Cu5Ni15)100-xSix 合金 20
4.1.3 (Ti80Cu15Ni5)100-xSix 合金 21
4.1.4 (Ti70Cu10Ni20)100-xSix 合金 22
4.1.5 Ti-TiCu-TiNi（5 at. % Si）800 oC恆溫截面 23
4.1.7 Ti-Cu-Ni-Si於富鈦區相關係 28
4.2 Ti-Cu-Ni-Si合金 擴散偶實驗 31
4.2.1 B3擴散偶 31
4.2.2 B4擴散偶 33
伍、結論 33
Ti-Cu-Ni-Si 四元系統於富鈦區相平衡關係 34
陸、參考文獻 34

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